Valley City, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.7 °F (low) to 51.6 °F (high). Annual precipitation averages 21.6 Inches. Valley City is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.6 °F | 17.4 °F | 0.52 in. |
| February | 2.3 °F | 22.5 °F | 0.51 in. |
| March | 15.0 °F | 35.0 °F | 0.82 in. |
| April | 29.1 °F | 52.2 °F | 1.22 in. |
| May | 42.3 °F | 66.7 °F | 3.09 in. |
| June | 53.7 °F | 76.2 °F | 3.98 in. |
| July | 57.8 °F | 81.3 °F | 3.17 in. |
| August | 54.9 °F | 80.2 °F | 2.72 in. |
| September | 45.5 °F | 71.3 °F | 2.4 in. |
| October | 32.7 °F | 55.4 °F | 1.8 in. |
| November | 18.8 °F | 37.8 °F | 0.64 in. |
| December | 6.4 °F | 23.3 °F | 0.7 in. |
| Annual | 29.7 °F | 51.6 °F | 21.57 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |